High Ammonia levels!

[fish 4 life]

Hey guys i have a 20 gallon tank that has been setup for about 2 months now. I had high ammonia levels in the beginning (which killed my F8 puffer) but then i started to use reverse osmosis water which lowered it back to 0. I thought my ammonia problems were gone so i bought two pangasius catfish. A week after i got them the water started to turn cloudy i tested the water the levels were 0 nitrite, 0 nitrate, 7.3 ph, 1.00 ppm ammonia!!!!! It ended up taking the lives of my two pangasius!!! What the heck is going on????? I did a 25% water change today and plan on doing another tomorrow..
PLEASE HELP!
This is my filter at the bottom it has 1 inch sponge, 1/2 inch filter floss, 1 inch carbon bag, biomedia


This is a shot of my tank

 

[Excedrin102]

What are your Nitrite,Nitrate levels? and how often and how much do you feed?


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[CichlidJoe]

You could try some Nite-Out 2 that might help.

Here's a pic:


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[fish 4 life]

Nitrate 0, nitrite 0 i feed nightly

 

[fish 4 life]

i have ammonia lock but i have used it and it does not seem to lower the ammonia levels

 

[Excedrin102]

Do a 30 to 40 % water change today then another 20 % in 24 hours and cut back feeding to every other day and see if that helps.


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[fishe]

0 nitrate is impossible, this is a big sign that the tank is not cycled... Did you cycle it??


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[Excedrin102]

And how often do you do water changes?


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[fish 4 life]

umm how do you know if it is cycled? i have had it for 2 months. i do a 25% water change each week with reverse osmosis water

 

[Excedrin102]

Well if you used water conditioner and beneficial bacteria it should be cycled by now.What kind of filtration do you have?.


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